diff --git a/lib/sidekiq_prometheus.rb b/lib/sidekiq_prometheus.rb
index 986c85c..36decdf 100644
--- a/lib/sidekiq_prometheus.rb
+++ b/lib/sidekiq_prometheus.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require "benchmark"
 require "rack"
 require "rackup"
 require "prometheus/client"
diff --git a/lib/sidekiq_prometheus/job_metrics.rb b/lib/sidekiq_prometheus/job_metrics.rb
index 2e2de56..ccbc452 100644
--- a/lib/sidekiq_prometheus/job_metrics.rb
+++ b/lib/sidekiq_prometheus/job_metrics.rb
@@ -15,7 +15,7 @@ def call(worker, job, queue)
       labels.merge!(custom_labels(worker))
 
       result = nil
-      duration = Benchmark.realtime { result = yield }
+      duration = measuring_duration { result = yield }
 
       # In case the labels have changed after the worker perform method has been called
       labels.merge!(custom_labels(worker))
@@ -52,4 +52,10 @@ def registry
   def custom_labels(worker)
     worker.respond_to?(:prometheus_labels) ? worker.prometheus_labels : {}
   end
+
+  def measuring_duration
+    start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+    yield
+    Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time
+  end
 end